text: * SOX gene family
  ** Sex-Determining Region Y Protein
  ** SOX1, SOX2, etc.
  * TCF/LEF family (T cell factor/lymphoid enhancer factor family)
  ** LEF1 (Lymphoid enhancer-binding factor 1)
  ** TCF7 (TCF-1)
  ** TCF7L1 (TCF-3)
  ** TCF7L2 (TCF-4)